<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <style>
    *{
        margin: 0;
        padding: 0;
    }
    div{
        width: 100px;
        height: 100px;
        background-color: burlywood;
        position: absolute;
        animation: move 5s infinite linear;

    }
    @keyframes move{
        from{
            top: 0;
            left: 0;
        }
        to{
            top: calc(100% - 100px);
            left: 600px;
        }
    }
</style>
<div></div>
</body>
</html>